WaterWater Hardness in London
330 postcode districts • 1 counties
Water Hardness Across London
The average water hardness in the London region is 286 ppm, classified as hard. Across 330 postcode districts, hardness ranges from 150 ppm to 350 ppm.
The region is served by Affinity Water, SES Water, Severn Trent Water, South East Water, Thames Water, Yorkshire Water. Water hardness varies by county — see the breakdown below or check your specific postcode.
Counties in London
| County | Avg Hardness | PPM | Level | Postcodes |
|---|---|---|---|---|
| Greater London | 286 ppm | Hard | 330 |
Water Companies in London
Hard Water Guides
Learn more about water hardness and how to manage it.
Recommended Products for London
Top picks for households in hard water areas across London.
Water2Buy W2B200 Water Softener
From ~£400Best-value whole-house ion-exchange softener for UK homes. Eliminates limescale from pipes, boilers, and appliances. Digital metered regeneration — low salt use. 7-year warranty.
View on AmazonPhilips AWP1775 Shower Filter
From ~£30Instant improvement for skin and hair. Reduces chlorine and limescale at the showerhead — no plumbing needed. A good first step before committing to a full softener.
View on AmazonGet Water Hardness Updates
Be notified when your water company reports changes to hardness levels.